[ADD] accounting: How to get paid and organize customer follow-ups?

https://docs.google.com/document/d/1Lk1g-M2TRzo8Pl-w37dRLvOvSQAp8iyTLr4-jcbrWbE/edit

accounting/receivables/customer_payments/followup.rst

@@ -1,3 +1,173 @@
 =================================================
 How to get paid and organize customer follow-ups?
 =================================================
+
+Getting paid and organizing customer reminders is always a difficult
+task, however it is critical for the health of the company to stay
+diligent about outstanding receivables. Fortunately, Odoo provides the
+right tools to track receivables, automate customer statements, and
+measure your performance.
+
+Customer follow-ups: A step by step guide
+=========================================
+
+Cleaning up outstanding payments
+--------------------------------
+
+If you have any unreconciled transactions in your bank account, you will
+need to process them first before you begin analyzing your customers
+statements. This ensures that you have recorded all of the latest
+customer payments before sending out reminders to any customers with
+outstanding balances.
+
+.. image:: ./media/followup01.png
+  :align: center
+
+Checking the Aged Receivables report
+------------------------------------
+
+After you have reconciled all of your bank accounts, you can then
+generate an accurate Aged Receivables Report from the Reports menu. This
+report will display all of the customers and their outstanding balances
+on open invoices.
+
+.. image:: ./media/followup02.png
+  :align: center
+
+The report displays this information in time increments to better paint
+a picture of the outstanding balances your customers hold and for how
+long they have held these outstanding balances. You can then
+appropriately focus your efforts on the appropriate customers.
+
+You can then select any of the customers on this list and Odoo will open
+up their invoice details in the form of the Customer Follow-Up letter,
+also known as the **Customer Statement**.
+
+.. image:: ./media/followup03.png
+  :align: center
+
+From the customer statement, you can:
+
+- Change and customize the message that is sent to the customer
+
+- Send a reminder email to the customer
+
+- Send a printed reminder letter to the customer
+
+- Send automated printed reminders by utilizing our Docsaway
+  integration
+
+- Zoom in on the different open invoices or payments
+
+- Remove an invoice or payment from the report (in case of conflict)
+
+- Log any call notes made to the customer
+
+- Schedule your next follow up task to stay on top of customer payments
+  (e.g. call back in 15 days if not payments are made)
+
+You can set reminders for when you would like to next contact the
+particular customer. Selecting **Manual** will open up the follow up
+scheduling tool, while selecting **Auto** will automatically recommend that
+you contact the customer 15 days from then if the customer has not yet
+paid for the invoice. Installing the **Follow-Up Plans** module will allow
+you to define automated actions and intervals to send reminders.
+
+.. image:: ./media/followup04.png
+  :align: center
+
+If you have already sent out a reminder to a customer a few days ago, a
+warning message will appear at the top of the screen, reminding you that
+you should not send another reminder so soon since one was already sent
+recently. Every time you log a note, Odoo will automatically set the
+next reminder date, unless you choose to manually set it by selecting
+the next reminder button at the top right of the screen.
+
+.. tip::
+	
+	You can also specify the expected payment date on an invoice line directly,
+	therefore defining the next reminder in case the invoice has not been paid.
+
+Sending customer statements
+---------------------------
+
+Send your customers reminders in batches in the menu :menuselection:`Sales -->
+Customer Statements`.
+
+Here Odoo will open all the statements awaiting to be processed, which
+is determined by the last reminder they received. You can choose to
+process them one by one, send multiple letters or emails in batches, or
+set a next action date for the next time they'll be contacted.
+
+.. note::
+
+	If an invoice has not yet been paid, Odoo will remind you to contact at
+	particular customer based after their next action date.
+
+You can access the customer statement report daily and Odoo will only
+display the customers you need to contact on any given day. This is
+based on:
+
+- Customers you have not yet received a payment from
+
+- Customers that have not been reminded over the last X days ("X" being
+  defined as the overdue date of the invoice after the first
+  reminder, then the next action date set at every reminder)
+
+Setting up your dunning process
+-------------------------------
+
+The **Payment Follow-up Management** module allows you to define
+reminder plans. After installing it from the **Apps** menu, go to the
+**Follow-up Levels** menu in the accounting configuration to set up your
+dunning process.
+
+Some Examples are:
+
+- **Email**: 3 days before overdue date
+
+- **Email+Letter**: at the overdue date
+
+- **Email+Call**: 15 days after the overdue date
+
+- **Email+Letter**: 60 days after the overdue date
+
+.. image:: ./media/followup05.png
+  :align: center
+
+Thanks to this module, you can send every email and letters in batches
+for all your customers at once. The next reminder will automatically be
+computed based on your configured follow-up plan.
+
+The module will also add a red/green dot on each customer, this will
+allow you to easily mark customer status's with the following options:
+"Good Debtor, Normal Debtor, or bad debtors.
+
+.. image:: ./media/followup06.png
+  :align: center
+
+DSO: Measuring your performance
+===============================
+
+The DSO (Days of Outstanding Sales) is a measure of the average number
+of days that a company takes to collect revenue after a sale has been
+made. DSO is calculated by dividing the amount of accounts receivable
+during a given period by the total value of credit sales during the same
+period, and multiplying the result by the number of days in the period
+measured.
+
+You can get the DSO of your company from the Executive Summary report
+under Reporting (check the KPI average debtors days).
+
+.. image:: ./media/followup07.png
+  :align: center
+
+.. seealso::
+
+	* :doc:`recording`
+	* :doc:`cheques`
+
+.. rst-class:: text-muted
+
+| Written by Fabien Pinckaers (Odoo)
+| Proofread by Geoffrey Bressan (Odoo)